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FreeBSD-EN-15:14.ixgbe                                          Errata Notice
                                                          The FreeBSD Project

Topic:          Disable ixgbe(4) flow-director support

Category:       core
Module:         ixgbe
Announced:      2015-08-25
Credits:        Marc De La Gueronniere (Verisign, Inc.)
Affects:        FreeBSD 10.1
Corrected:      2014-10-11 22:10:39 UTC (stable/10, 10.1-STABLE)
                2015-08-25 20:48:58 UTC (releng/10.1, 10.1-RELEASE-p19)

For general information regarding FreeBSD Errata Notices and Security
Advisories, including descriptions of the fields above, security
branches, and the following sections, please visit
<URL:https://security.freebsd.org/>.

I.   Background

Flow director is an Intel technology to steer incoming packets in application
aware fashion.

II.  Problem Description

Flow director support is not completely/correctly implemented in FreeBSD at
this time.

III. Impact

Enabling flow director support may cause traffic to land on a wrong RX queue
of the NIC, resulting in bad or sub-optimal performance on the receive side.

IV.  Workaround

No workaround is available, but systems that do not have Intel(R) 82559
series 10Gb Ethernet Controllers are not affected.

V.   Solution

Perform one of the following:

1) Upgrade your system to a supported FreeBSD stable or release / security
branch (releng) dated after the correction date.

2) To update your present system via a binary patch:

Systems running a RELEASE version of FreeBSD on the i386 or amd64
platforms can be updated via the freebsd-update(8) utility:

# freebsd-update fetch
# freebsd-update install

3) To update your present system via a source code patch:

The following patches have been verified to apply to the applicable
FreeBSD release branches.

a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.

# fetch https://security.FreeBSD.org/patches/EN-15:14/ixgbe.patch
# fetch https://security.FreeBSD.org/patches/EN-15:14/ixgbe.patch.asc
# gpg --verify ixgbe.patch.asc

b) Apply the patch.  Execute the following commands as root:

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in
<URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.

VI.  Correction details

The following list contains the correction revision numbers for each
affected branch.

Branch/path                                                      Revision
- -------------------------------------------------------------------------
stable/10/                                                        r272967
releng/10.1/                                                      r287146
- -------------------------------------------------------------------------

To see which files were modified by a particular revision, run the
following command, replacing NNNNNN with the revision number, on a
machine with Subversion installed:

# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base

Or visit the following URL, replacing NNNNNN with the revision number:

<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>

VII. References

The latest revision of this Errata Notice is available at
https://security.FreeBSD.org/advisories/FreeBSD-EN-15:14.ixgbe.asc

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